Fun Factory NOS Vibrating Cock Ring BlackNOS heats things up with two rumbly motors at the top, perfectly sized and shaped to hug the clitoral glans for a more intense sensation. Designed to be worn comfortably around the shaft, while applying pressure for a harder, longer lasting erection, and more explosive orgasm; more advanced users can use NOS to fit behind testicles as well! NOS can be used on both erect and flaccid penises, is great for hands free play, has 4 speeds, a "flirt mode"